Yes, you can replace the gasket; it's very straight forward. I wouldn't try to make any adjustments, but look for anything that looks like it could be damaged while you have the cover off.

 

Might be a little late but, i found this kit to do my tune up ......



Got it at RockAuto for 32 bucks.....

 

Yep, too late. LOL

I pulled the #8 plug today since I wasn't doing anything productive, and this is after a couple of days driving..



I put a socket on the valve covers where I saw bolt heads.. I couldn't get them on the threaded ones sticking up..some were a bit loose, but nothing real major, maybe 1/4-1/2 turn to tighten.. I never took them off since I would have to remove a lot of stuff it looks like to get to them. I'll leave it to a pro, don't want to mess anything up. I don't have a backup vehicle.